Graph traversal and pathfinding extension for SharpCoreDB.

Version: v1.9.1
Package: SharpCoreDB.Graph

• ✅ Aligned package metadata and version references to the synchronized 1.9.1 release line.
• ✅ Release automation now publishes all packable SharpCoreDB packages in CI/CD.

• Graph traversal: BFS, DFS, and bidirectional traversal
• A* pathfinding for shortest-path workloads
• SQL integration via graph traversal helpers
• Traversal strategy optimization and metrics components
• Hybrid graph/vector optimization integration points

• Package release aligned to v1.9.0
• Documentation updated to current graph package scope
• Inherits v1.9.0 core parser/durability improvements
• Companion package SharpCoreDB.Graph.Advanced added for analytics + GraphRAG workflows

dotnet add package SharpCoreDB.Graph --version 1.9.0

• docs/INDEX.md
• src/SharpCoreDB.Graph.Advanced/README.md